subsequence

subsequence

The subsequence() function returns part of an input sequence, identified by the start position and length of the sub-sequence required.

For example, the expression «subsequence (("a", "b", "c", "d"), 2, 2) » returns «("b", "c") » .

Argument	Data Type	Meaning
sequence	item()*	The input sequence
start	xs:double	The position of the first item to be included in the result
length (optional)	xs:double	The number of items to be included in the result. If this argument is omitted, all items after the start position are included
Result	xs:string	The sequence of items starting at the start position